[PowerPC] Eliminate compares - add i32 sext/zext handling for SETLE/SETGE

Adds handling for SETLE/SETGE comparisons on i32 values. Furthermore, it adds
the handling for the special case where RHS == 0.

Differential Revision: https://reviews.llvm.org/D34048


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310346 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 68 insertions, 0 deletions

diff --git a/test/CodeGen/PowerPC/testComparesigesi.ll b/test/CodeGen/PowerPC/testComparesigesi.ll
new file mode 100644
index 00000000000..01de5d97628
--- /dev/null
+++ b/test/CodeGen/PowerPC/testComparesigesi.ll
@@ -0,0 +1,68 @@
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -O2 \
+; RUN:   -ppc-asm-full-reg-names -mcpu=pwr8 < %s | FileCheck %s \
+; RUN:  --implicit-check-not cmpw --implicit-check-not cmpd --implicit-check-not cmpl
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -O2 \
+; RUN:   -ppc-asm-full-reg-names -mcpu=pwr8 < %s | FileCheck %s \
+; RUN:  --implicit-check-not cmpw --implicit-check-not cmpd --implicit-check-not cmpl
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+@glob = common local_unnamed_addr global i32 0, align 4
+
+define signext i32 @test_igesi(i32 signext %a, i32 signext %b) {
+; CHECK-LABEL: test_igesi:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    subf r3, r4, r3
+; CHECK-NEXT:    rldicl r3, r3, 1, 63
+; CHECK-NEXT:    xori r3, r3, 1
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp sge i32 %a, %b
+  %conv = zext i1 %cmp to i32
+  ret i32 %conv
+}
+
+define signext i32 @test_igesi_sext(i32 signext %a, i32 signext %b) {
+; CHECK-LABEL: test_igesi_sext:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    subf r3, r4, r3
+; CHECK-NEXT:    rldicl r3, r3, 1, 63
+; CHECK-NEXT:    addi r3, r3, -1
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp sge i32 %a, %b
+  %sub = sext i1 %cmp to i32
+  ret i32 %sub
+}
+
+define void @test_igesi_store(i32 signext %a, i32 signext %b) {
+; CHECK-LABEL: test_igesi_store:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    addis r5, r2, .LC0@toc@ha
+; CHECK-NEXT:    subf r3, r4, r3
+; CHECK-NEXT:    ld r12, .LC0@toc@l(r5)
+; CHECK-NEXT:    rldicl r3, r3, 1, 63
+; CHECK-NEXT:    xori r3, r3, 1
+; CHECK-NEXT:    stw r3, 0(r12)
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp sge i32 %a, %b
+  %conv = zext i1 %cmp to i32
+  store i32 %conv, i32* @glob, align 4
+  ret void
+}
+
+define void @test_igesi_sext_store(i32 signext %a, i32 signext %b) {
+; CHECK-LABEL: test_igesi_sext_store:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    addis r5, r2, .LC0@toc@ha
+; CHECK-NEXT:    subf r3, r4, r3
+; CHECK-NEXT:    ld r12, .LC0@toc@l(r5)
+; CHECK-NEXT:    rldicl r3, r3, 1, 63
+; CHECK-NEXT:    addi r3, r3, -1
+; CHECK-NEXT:    stw r3, 0(r12)
+; CHECK-NEXT:    blr
+entry:
+  %cmp = icmp sge i32 %a, %b
+  %sub = sext i1 %cmp to i32
+  store i32 %sub, i32* @glob, align 4
+  ret void
+}