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[PATCH][AArch64][GAS] Allow integer immediates for fmov instructions.

From: Tamar Christina <tamar dot christina at arm dot com>
To: binutils at sourceware dot org
Cc: nd at arm dot com, Richard dot Earnshaw at arm dot com, marcus dot shawcroft at arm dot com
Date: Thu, 10 May 2018 12:11:26 +0100
Subject: [PATCH][AArch64][GAS] Allow integer immediates for fmov instructions.
Nodisclaimer: True
Spamdiagnosticmetadata: NSPM
Spamdiagnosticoutput: 1:99

Hi All,

This patch makes it possible to use an integer immediate with the fmov instructions
allowing you to simply write fmov d0, #2 instead of needing fmov d0, #2.0.

The parse double function already know to deal with this so we just need to list the
restriction put in place in parser.

The is considered a QoL improvement for hand assembly writers and allows more
code portability between assembler.


Cross compiled and regtested:

 * aarch64-none-elf
 * aarch64_be-none-elf

and no regressions.

Bootstrapped and regtested on:

 * aarch64-none-elf
 * aarch64-none-elf (32 bit host)

and no regressions.

Ok for master?

Thanks,
Tamar

gas/
2018-05-10  Tamar Christina  <tamar.christina@arm.com>
	* config/tc-aarch64.c (parse_aarch64_imm_float): Remove restrictions.
	* testsuite/gas/aarch64/diagnostic.s: Move fmov int rest to..
	* testsuite/gas/aarch64/fpmov.s: Here.
	* testsuite/gas/aarch64/fpmov.d: Update results with fmov.
	* testsuite/gas/aarch64/diagnostic.l: Remove fmov values.
	* testsuite/gas/aarch64/sve-invalid.s: Update test files.
	* testsuite/gas/aarch64/sve-invalid.l: Likewise

--

diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index 877703e1a373c5531794cc7fb3faf7918ab88849..f4bd3c4678fb128fa25dce59bb62104d65d34b1a 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -2279,7 +2279,6 @@ parse_aarch64_imm_float (char **ccp, int *immed, bfd_boolean dp_p,
   char *str = *ccp;
   char *fpnum;
   LITTLENUM_TYPE words[MAX_LITTLENUMS];
-  int found_fpchar = 0;
   int64_t val = 0;
   unsigned fpword = 0;
   bfd_boolean hex_p = FALSE;
@@ -2309,26 +2308,10 @@ parse_aarch64_imm_float (char **ccp, int *immed, bfd_boolean dp_p,
 
       hex_p = TRUE;
     }
-  else
-    {
-      if (reg_name_p (str, reg_type))
-	{
-	  set_recoverable_error (_("immediate operand required"));
-	  return FALSE;
-	}
-
-      /* We must not accidentally parse an integer as a floating-point number.
-	 Make sure that the value we parse is not an integer by checking for
-	 special characters '.' or 'e'.  */
-      for (; *fpnum != '\0' && *fpnum != ' ' && *fpnum != '\n'; fpnum++)
-	if (*fpnum == '.' || *fpnum == 'e' || *fpnum == 'E')
-	  {
-	    found_fpchar = 1;
-	    break;
-	  }
-
-      if (!found_fpchar)
-	return FALSE;
+  else if (reg_name_p (str, reg_type))
+   {
+     set_recoverable_error (_("immediate operand required"));
+     return FALSE;
     }
 
   if (! hex_p)
diff --git a/gas/testsuite/gas/aarch64/diagnostic.l b/gas/testsuite/gas/aarch64/diagnostic.l
index cd3ce9931c5e8a435d737cc528f1b1095f055250..00bb512394b3c4570b21a358c23204b0e5c60bfb 100644
--- a/gas/testsuite/gas/aarch64/diagnostic.l
+++ b/gas/testsuite/gas/aarch64/diagnostic.l
@@ -144,10 +144,6 @@
 [^:]*:256: Error: register element index out of range 0 to 15 at operand 1 -- `ld2 {v0\.b,v1\.b}\[-1\],\[x0\]'
 [^:]*:259: Error: register element index out of range 0 to 15 at operand 1 -- `ld2 {v0\.b,v1\.b}\[16\],\[x0\]'
 [^:]*:260: Error: register element index out of range 0 to 15 at operand 1 -- `ld2 {v0\.b,v1\.b}\[67\],\[x0\]'
-[^:]*:262: Error: invalid floating-point constant at operand 2 -- `fmov d0,#2'
-[^:]*:263: Error: invalid floating-point constant at operand 2 -- `fmov d0,#-2'
-[^:]*:264: Error: invalid floating-point constant at operand 2 -- `fmov s0,2'
-[^:]*:265: Error: invalid floating-point constant at operand 2 -- `fmov s0,-2'
 [^:]*:267: Error: integer 64-bit register expected at operand 2 -- `st2 {v0.4s,v1.4s},\[sp\],xzr'
 [^:]*:268: Error: integer or zero register expected at operand 2 -- `str x1,\[x2,sp\]'
 [^:]*:271: Error: relocation not allowed at operand 3 -- `ldnp x1,x2,\[x3,#:lo12:foo\]'
diff --git a/gas/testsuite/gas/aarch64/diagnostic.s b/gas/testsuite/gas/aarch64/diagnostic.s
index 12e85040d36428f6c0ff4e09fa6daac2a6ede2cc..a62327dabb8abdbba2830dc3bc5d3e2cfc3acb41 100644
--- a/gas/testsuite/gas/aarch64/diagnostic.s
+++ b/gas/testsuite/gas/aarch64/diagnostic.s
@@ -259,10 +259,10 @@
 	ld2	{v0.b, v1.b}[16], [x0]
 	ld2	{v0.b, v1.b}[67], [x0]
 
-	fmov	d0, #2
-	fmov	d0, #-2
-	fmov	s0, 2
-	fmov	s0, -2
+
+
+
+
 
 	st2	{v0.4s, v1.4s}, [sp], xzr
 	str	x1, [x2, sp]
diff --git a/gas/testsuite/gas/aarch64/fpmov.d b/gas/testsuite/gas/aarch64/fpmov.d
index fb032c60e39366dbe7e3cf8bdf6afad768f6763a..21c16b71b1726768c5240e06b7fa06bdf803f0e9 100644
--- a/gas/testsuite/gas/aarch64/fpmov.d
+++ b/gas/testsuite/gas/aarch64/fpmov.d
@@ -17,3 +17,7 @@ Disassembly of section .*:
   24:	1e69f000 	fmov	d0, #2\.421875000000000000e-01
   28:	1e69f000 	fmov	d0, #2\.421875000000000000e-01
   2c:	1e29f000 	fmov	s0, #2\.421875000000000000e-01
+  30:	1e601000 	fmov	d0, #2\.000000000000000000e\+00
+  34:	1e701000 	fmov	d0, #-2\.000000000000000000e\+00
+  38:	1e201000 	fmov	s0, #2\.000000000000000000e\+00
+  3c:	1e301000 	fmov	s0, #-2\.000000000000000000e\+00
diff --git a/gas/testsuite/gas/aarch64/fpmov.s b/gas/testsuite/gas/aarch64/fpmov.s
index ffc988173b31c117589e759e2af9d33f123e2b1e..0b0a63e2aca19c1795c36ee502d1c8f4a27f9011 100644
--- a/gas/testsuite/gas/aarch64/fpmov.s
+++ b/gas/testsuite/gas/aarch64/fpmov.s
@@ -15,3 +15,8 @@
 	fmov	d0, 0.2421875
 	fmov	d0, 0x3fcf000000000000
 	fmov	s0, 0x3e780000
+
+	fmov	d0, #2
+	fmov	d0, #-2
+	fmov	s0, 2
+	fmov	s0, -2
diff --git a/gas/testsuite/gas/aarch64/sve-invalid.l b/gas/testsuite/gas/aarch64/sve-invalid.l
index 6e614c3f6ee1d2dd14ee8caa5b64efa95117063d..32b7952436f36ebbe45f775924779a237675d493 100644
--- a/gas/testsuite/gas/aarch64/sve-invalid.l
+++ b/gas/testsuite/gas/aarch64/sve-invalid.l
@@ -820,23 +820,19 @@
 .*: Error: immediate out of range at operand 3 -- `bic z0\.d,z0\.d,#0xd'
 .*: Error: immediate zero expected at operand 4 -- `fcmeq p0\.s,p1/z,z2\.s,#1'
 .*: Error: immediate zero expected at operand 4 -- `fcmeq p0\.s,p1/z,z2\.s,#1\.0'
-.*: Error: invalid floating-point constant at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#0'
+.*: Error: floating-point value must be 0\.5 or 1\.0 at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#0'
 .*: Error: floating-point value must be 0\.5 or 1\.0 at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#0\.0'
-.*: Error: invalid floating-point constant at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#1'
 .*: Error: floating-point value must be 0\.5 or 1\.0 at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#1\.5'
-.*: Error: invalid floating-point constant at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#2'
+.*: Error: floating-point value must be 0\.5 or 1\.0 at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#2'
 .*: Error: floating-point value must be 0\.5 or 1\.0 at operand 4 -- `fadd z0\.s,p1/m,z0\.s,#2\.0'
-.*: Error: invalid floating-point constant at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#0'
+.*: Error: floating-point value must be 0\.5 or 2\.0 at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#0'
 .*: Error: floating-point value must be 0\.5 or 2\.0 at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#0\.0'
-.*: Error: invalid floating-point constant at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#1'
+.*: Error: floating-point value must be 0\.5 or 2\.0 at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#1'
 .*: Error: floating-point value must be 0\.5 or 2\.0 at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#1\.0'
 .*: Error: floating-point value must be 0\.5 or 2\.0 at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#1\.5'
-.*: Error: invalid floating-point constant at operand 4 -- `fmul z0\.s,p1/m,z0\.s,#2'
-.*: Error: invalid floating-point constant at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#0'
 .*: Error: floating-point value must be 0\.0 or 1\.0 at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#0\.5'
-.*: Error: invalid floating-point constant at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#1'
 .*: Error: floating-point value must be 0\.0 or 1\.0 at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#1\.5'
-.*: Error: invalid floating-point constant at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#2'
+.*: Error: floating-point value must be 0\.0 or 1\.0 at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#2'
 .*: Error: floating-point value must be 0\.0 or 1\.0 at operand 4 -- `fmax z0\.s,p1/m,z0\.s,#2\.0'
 .*: Error: operand 2 must be an enumeration value such as POW2 -- `ptrue p1\.b,vl0'
 .*: Error: operand 2 must be an enumeration value such as POW2 -- `ptrue p1\.b,vl255'
diff --git a/gas/testsuite/gas/aarch64/sve-invalid.s b/gas/testsuite/gas/aarch64/sve-invalid.s
index 148dbc85ac2e2c7ce2e5c5ebe9b2c77ea7603d77..204721ee17a45d43b9de52b860cccca8f2386ca5 100644
--- a/gas/testsuite/gas/aarch64/sve-invalid.s
+++ b/gas/testsuite/gas/aarch64/sve-invalid.s
@@ -914,7 +914,7 @@
 	fadd	z0.s, p1/m, z0.s, #0
 	fadd	z0.s, p1/m, z0.s, #0.0
 	fadd	z0.s, p1/m, z0.s, #0.5			// OK
-	fadd	z0.s, p1/m, z0.s, #1
+	fadd	z0.s, p1/m, z0.s, #1			// OK
 	fadd	z0.s, p1/m, z0.s, #1.0			// OK
 	fadd	z0.s, p1/m, z0.s, #1.5
 	fadd	z0.s, p1/m, z0.s, #2
@@ -923,16 +923,16 @@
 	fmul	z0.s, p1/m, z0.s, #0
 	fmul	z0.s, p1/m, z0.s, #0.0
 	fmul	z0.s, p1/m, z0.s, #0.5			// OK
-	fmul	z0.s, p1/m, z0.s, #1
+	fmul	z0.s, p1/m, z0.s, #1			// OK
 	fmul	z0.s, p1/m, z0.s, #1.0
 	fmul	z0.s, p1/m, z0.s, #1.5
-	fmul	z0.s, p1/m, z0.s, #2
+	fmul	z0.s, p1/m, z0.s, #2			// OK
 	fmul	z0.s, p1/m, z0.s, #2.0			// OK
 
-	fmax	z0.s, p1/m, z0.s, #0
+	fmax	z0.s, p1/m, z0.s, #0			// OK
 	fmax	z0.s, p1/m, z0.s, #0.0			// OK
 	fmax	z0.s, p1/m, z0.s, #0.5
-	fmax	z0.s, p1/m, z0.s, #1
+	fmax	z0.s, p1/m, z0.s, #1			// OK
 	fmax	z0.s, p1/m, z0.s, #1.0			// OK
 	fmax	z0.s, p1/m, z0.s, #1.5
 	fmax	z0.s, p1/m, z0.s, #2

Follow-Ups:
- Re: [PATCH][AArch64][GAS] Allow integer immediates for fmov instructions.
  - From: Nick Clifton

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