[PATCH][AARCH64]Fix immediate alternative of movhf_aarch64 pattern.

[Renlin Li]

Hi all,

For the immediate alternative, the constraint checks the operand with HF mode
while SImode is provided to the output template generation function.

Before the change, this inconsistency causes an ICE compiling the new test case 
in the patch.


aarch64-none-elf regression test Okay. Okay to commit the patch?

Regards,
Renlin

gcc/ChangeLog:

2018-03-07  Renlin Li  <renlin...@arm.com>

        * config/aarch64/aarch64.md (movhf_aarch64): Fix mode argument to
        aarch64_output_scalar_simd_mov_immediate.

gcc/testsuite/ChangeLog:

2018-03-07  Renlin Li  <renlin...@arm.com>

        * gcc.target/aarch64/movi_hf.c: New.
        * gcc.target/aarch64/f16_mov_immediate_1.c: Update.

diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 5a2a9309a3bbbfad6fcb6db07422d774909f0ba1..391fdd07e52f4d165a0109e3baa82571bafa37de 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -1145,7 +1145,7 @@
    umov\\t%w0, %1.h[0]
    mov\\t%0.h[0], %1.h[0]
    fmov\\t%h0, %1
-   * return aarch64_output_scalar_simd_mov_immediate (operands[1], SImode);
+   * return aarch64_output_scalar_simd_mov_immediate (operands[1], HImode);
    ldr\\t%h0, %1
    str\\t%h1, %0
    ldrh\\t%w0, %1
diff --git a/gcc/testsuite/gcc.target/aarch64/f16_mov_immediate_1.c b/gcc/testsuite/gcc.target/aarch64/f16_mov_immediate_1.c
index 1ed3831e139745227487eafa3ccfdc05c99deb34..3d22d225851af653f17e04ce7c7cc65ee1c86172 100644
--- a/gcc/testsuite/gcc.target/aarch64/f16_mov_immediate_1.c
+++ b/gcc/testsuite/gcc.target/aarch64/f16_mov_immediate_1.c
@@ -45,5 +45,5 @@ __fp16 f5 ()
 }
 
 /* { dg-final { scan-assembler-times "mov\tw\[0-9\]+, #?19520"           3 } } */
-/* { dg-final { scan-assembler-times "movi\tv\[0-9\]+\\\.2s, 0xbc, lsl 8"  1 } } */
-/* { dg-final { scan-assembler-times "movi\tv\[0-9\]+\\\.2s, 0x4c, lsl 8"  1 } } */
+/* { dg-final { scan-assembler-times "movi\tv\[0-9\]+\\\.4h, 0xbc, lsl 8"  1 } } */
+/* { dg-final { scan-assembler-times "movi\tv\[0-9\]+\\\.4h, 0x4c, lsl 8"  1 } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/movi_hf.c b/gcc/testsuite/gcc.target/aarch64/movi_hf.c
new file mode 100644
index 0000000000000000000000000000000000000000..9521b9b09c87bd5f19cb6b62b1228bae685d8667
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/movi_hf.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O0 -std=c99" } */
+
+__fp16
+foo ()
+{
+  /* { dg-final { scan-assembler "movi\tv\[0-9\]+\.8b" } } */
+  return 0x1.544p5;
+}