Fix (bitcast (fabs x)), (bitcast (fneg x)) and (bitcast (fcopysign cst,

x)) combines for ppc_fp128, since signbit computation is more
complicated.

Discussion thread:
http://lists.llvm.org/pipermail/llvm-dev/2015-November/092863.html

Patch by Tim Shen!

llvm-svn: 255305

1 files changed, 103 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PowerPC/fp128-bitcast-after-operation.ll b/llvm/test/CodeGen/PowerPC/fp128-bitcast-after-operation.ll
new file mode 100644
index 00000000000..5f3c9278f8d
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/fp128-bitcast-after-operation.ll
@@ -0,0 +1,103 @@
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr8 < %s | FileCheck %s -check-prefix=PPC64
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr7 < %s | FileCheck %s -check-prefix=PPC64
+; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr8 < %s | FileCheck %s -check-prefix=PPC64
+; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 < %s | FileCheck %s -check-prefix=PPC64
+; RUN: llc -mtriple=powerpc-unknown-linux-gnu < %s | FileCheck %s -check-prefix=PPC32
+
+define i128 @test_abs(ppc_fp128 %x) nounwind  {
+entry:
+; PPC64-LABEL: test_abs:
+; PPC64-DAG: stxsdx 2, 0, [[ADDR_HI:[0-9]+]]
+; PPC64-DAG: stxsdx 1, 0, [[ADDR_LO:[0-9]+]]
+; PPC64-DAG: addi [[ADDR_HI]], [[SP:[0-9]+]], [[OFFSET_HI:-?[0-9]+]]
+; PPC64-DAG: addi [[ADDR_LO]], [[SP]], [[OFFSET_LO:-?[0-9]+]]
+; PPC64-DAG: li [[MASK_REG:[0-9]+]], 1
+; PPC64: sldi [[MASK_REG]], [[MASK_REG]], 63
+; PPC64-DAG: ld [[HI:[0-9]+]], [[OFFSET_LO]]([[SP]])
+; PPC64-DAG: ld [[LO:[0-9]+]], [[OFFSET_HI]]([[SP]])
+; PPC64: and [[FLIP_BIT:[0-9]+]], [[HI]], [[MASK_REG]]
+; PPC64-DAG: xor 3, [[HI]], [[FLIP_BIT]]
+; PPC64-DAG: xor 4, [[LO]], [[FLIP_BIT]]
+; PPC64: blr
+
+; PPC32-DAG: stfd 1, 24(1)
+; PPC32-DAG: stfd 2, 16(1)
+; PPC32: nop
+; PPC32-DAG: lwz [[HI0:[0-9]+]], 24(1)
+; PPC32-DAG: lwz [[LO0:[0-9]+]], 16(1)
+; PPC32-DAG: lwz [[HI1:[0-9]+]], 28(1)
+; PPC32-DAG: lwz [[LO1:[0-9]+]], 20(1)
+; PPC32: rlwinm [[FLIP_BIT:[0-9]+]], [[HI0]], 0, 0, 0
+; PPC32-DAG: xor [[HI0]], [[HI0]], [[FLIP_BIT]]
+; PPC32-DAG: xor [[LO0]], [[LO0]], [[FLIP_BIT]]
+; PPC32: blr
+	%0 = tail call ppc_fp128 @llvm.fabs.ppcf128(ppc_fp128 %x)
+	%1 = bitcast ppc_fp128 %0 to i128
+	ret i128 %1
+}
+
+define i128 @test_neg(ppc_fp128 %x) nounwind  {
+entry:
+; PPC64-LABEL: test_neg:
+; PPC64-DAG: stxsdx 2, 0, [[ADDR_HI:[0-9]+]]
+; PPC64-DAG: stxsdx 1, 0, [[ADDR_LO:[0-9]+]]
+; PPC64-DAG: addi [[ADDR_HI]], [[SP:[0-9]+]], [[OFFSET_HI:-?[0-9]+]]
+; PPC64-DAG: addi [[ADDR_LO]], [[SP]], [[OFFSET_LO:-?[0-9]+]]
+; PPC64-DAG: li [[FLIP_BIT:[0-9]+]], 1
+; PPC64-DAG: sldi [[FLIP_BIT]], [[FLIP_BIT]], 63
+; PPC64-DAG: ld [[HI:[0-9]+]], [[OFFSET_LO]]([[SP]])
+; PPC64-DAG: ld [[LO:[0-9]+]], [[OFFSET_HI]]([[SP]])
+; PPC64-NOT: BARRIER
+; PPC64-DAG: xor 3, [[HI]], [[FLIP_BIT]]
+; PPC64-DAG: xor 4, [[LO]], [[FLIP_BIT]]
+; PPC64: blr
+
+; PPC32-DAG: stfd 1, 24(1)
+; PPC32-DAG: stfd 2, 16(1)
+; PPC32: nop
+; PPC32-DAG: lwz [[HI0:[0-9]+]], 24(1)
+; PPC32-DAG: lwz [[LO0:[0-9]+]], 16(1)
+; PPC32-DAG: lwz [[HI1:[0-9]+]], 28(1)
+; PPC32-DAG: lwz [[LO1:[0-9]+]], 20(1)
+; PPC32-NOT: BARRIER
+; PPC32-DAG: xoris [[HI0]], [[HI0]], 32768
+; PPC32-DAG: xoris [[LO0]], [[LO0]], 32768
+; PPC32: blr
+	%0 = fsub ppc_fp128 0xM80000000000000000000000000000000, %x
+	%1 = bitcast ppc_fp128 %0 to i128
+	ret i128 %1
+}
+
+define i128 @test_copysign(ppc_fp128 %x) nounwind  {
+entry:
+; PPC64-LABEL: test_copysign:
+; PPC64-DAG: stxsdx 1, 0, [[ADDR_REG:[0-9]+]]
+; PPC64-DAG: addi [[ADDR_REG]], 1, [[OFFSET:-?[0-9]+]]
+; PPC64-DAG: li [[SIGN:[0-9]+]], 1
+; PPC64-DAG: sldi [[SIGN]], [[SIGN]], 63
+; PPC64-DAG: li [[HI_TMP:[0-9]+]], 16399
+; PPC64-DAG: sldi [[CST_HI:[0-9]+]], [[HI_TMP]], 48
+; PPC64-DAG: li [[LO_TMP:[0-9]+]], 3019
+; PPC64-DAG: sldi [[CST_LO:[0-9]+]], [[LO_TMP]], 52
+; PPC64-NOT: BARRIER
+; PPC64-DAG: ld [[X_HI:[0-9]+]], [[OFFSET]](1)
+; PPC64-DAG: and [[NEW_HI_TMP:[0-9]+]], [[X_HI]], [[SIGN]]
+; PPC64-DAG: or 3, [[NEW_HI_TMP]], [[CST_HI]]
+; PPC64-DAG: xor 4, [[SIGN]], [[CST_LO]]
+; PPC64: blr
+
+; PPC32: stfd 1, [[STACK:[0-9]+]](1)
+; PPC32: nop
+; PPC32: lwz [[HI:[0-9]+]], [[STACK]](1)
+; PPC32: rlwinm [[FLIP_BIT:[0-9]+]], [[HI]], 0, 0, 0
+; PPC32-NOT: BARRIER
+; PPC32-DAG: oris {{[0-9]+}}, [[FLIP_BIT]], 16399
+; PPC32-DAG: xoris {{[0-9]+}}, [[FLIP_BIT]], 48304
+; PPC32: blr
+	%0 = tail call ppc_fp128 @llvm.copysign.ppcf128(ppc_fp128 0xMBCB0000000000000400F000000000000, ppc_fp128 %x)
+	%1 = bitcast ppc_fp128 %0 to i128
+	ret i128 %1
+}
+
+declare ppc_fp128 @llvm.fabs.ppcf128(ppc_fp128)
+declare ppc_fp128 @llvm.copysign.ppcf128(ppc_fp128, ppc_fp128)