diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/2011-11-09-FoldImpDefs.ll | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2011-11-09-FoldImpDefs.ll b/test/CodeGen/X86/2011-11-09-FoldImpDefs.ll new file mode 100644 index 0000000000..095d8c68c2 --- /dev/null +++ b/test/CodeGen/X86/2011-11-09-FoldImpDefs.ll @@ -0,0 +1,105 @@ +; RUN: llc < %s -verify-regalloc | FileCheck %s +; PR11347 +; +; This test case materializes the constant 1 in a register: +; +; %vreg19<def> = MOV32ri 1 +; +; Then rematerializes the instruction for a sub-register copy: +; 1168L %vreg14:sub_8bit<def,undef> = COPY %vreg19:sub_8bit<kill>, %vreg14<imp-def>; GR32:%vreg14,%vreg19 +; Considering merging %vreg19 with %vreg14 +; RHS = %vreg19 = [560d,656L:0)[720L,976d:0)[1088L,1168d:0) 0@560d +; LHS = %vreg14 = [16d,160L:0)[160L,256L:2)[256L,1088L:1)[1168d,1184L:3)[1184L,1344L:2) 0@16d-phikill 1@256L-phidef-phikill 2@1184L-phidef-phikill 3@1168d-phikill +; Remat: %vreg14<def> = MOV32ri 1, %vreg14<imp-def>, %vreg14<imp-def>; GR32:%vreg14 +; +; This rematerialized constant is feeding a PHI that is spilled, so the constant +; is written directly to a stack slot that gets the %esi function argument in +; another basic block: +; +; CHECK: %entry +; CHECK: movl %esi, [[FI:[0-9]+\(%rsp\)]] +; CHECK: %if.else24 +; CHECK: movl $1, [[FI]] +; CHECK: %lor.end9 +; CHECK: movl [[FI]], +; +; Those <imp-def> operands on the MOV32ri instruction confused the spiller +; because they were preserved by TII.foldMemoryOperand. It is quite rare to +; see a rematerialized instruction spill, it can only happen when it is feeding +; a PHI. + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.7" + +@g_193 = external global i32, align 4 +@g_103 = external global i32, align 4 + +declare i32 @func_21(i16 signext, i32) nounwind uwtable readnone ssp + +define i32 @func_25(i32 %p_27, i8 signext %p_28, i32 %p_30) noreturn nounwind uwtable ssp { +entry: + br label %for.cond + +for.cond28.for.cond.loopexit_crit_edge: ; preds = %for.cond28thread-pre-split + store i32 0, i32* @g_103, align 4 + br label %for.cond + +for.cond: ; preds = %for.cond28thread-pre-split, %for.cond28.for.cond.loopexit_crit_edge, %entry + %l_365.0 = phi i32 [ undef, %entry ], [ %and, %for.cond28.for.cond.loopexit_crit_edge ], [ %and, %for.cond28thread-pre-split ] + %l_288.0 = phi i32 [ undef, %entry ], [ %l_288.1.ph, %for.cond28.for.cond.loopexit_crit_edge ], [ %l_288.1.ph, %for.cond28thread-pre-split ] + %l_349.0 = phi i32 [ undef, %entry ], [ %xor, %for.cond28.for.cond.loopexit_crit_edge ], [ %xor, %for.cond28thread-pre-split ] + %p_28.addr.0 = phi i8 [ %p_28, %entry ], [ %p_28.addr.1.ph, %for.cond28.for.cond.loopexit_crit_edge ], [ %p_28.addr.1.ph, %for.cond28thread-pre-split ] + br i1 undef, label %for.cond31, label %lor.end + +lor.end: ; preds = %for.cond + %tobool3 = icmp eq i32 %l_349.0, 0 + br i1 %tobool3, label %for.cond31, label %if.then + +if.then: ; preds = %lor.end + br i1 undef, label %lor.rhs6, label %lor.end9 + +lor.rhs6: ; preds = %if.then + br label %lor.end9 + +lor.end9: ; preds = %lor.rhs6, %if.then + %and = and i32 %l_365.0, 1 + %conv11 = sext i8 %p_28.addr.0 to i32 + %xor = xor i32 %and, %conv11 + br i1 false, label %if.else, label %if.end + +if.else: ; preds = %lor.end9 + br label %if.end + +if.end: ; preds = %if.else, %lor.end9 + %l_395.0 = phi i32 [ 0, %if.else ], [ 1, %lor.end9 ] + %cmp14 = icmp ne i32 %and, %conv11 + %conv15 = zext i1 %cmp14 to i32 + br i1 %cmp14, label %if.then16, label %for.cond28thread-pre-split + +if.then16: ; preds = %if.end + %or17 = or i32 %l_288.0, 1 + %call18 = tail call i32 @func_39(i32 0, i32 %or17, i32 0, i32 0) nounwind + br i1 undef, label %if.else24, label %if.then20 + +if.then20: ; preds = %if.then16 + %conv21 = trunc i32 %l_395.0 to i16 + %call22 = tail call i32 @func_21(i16 signext %conv21, i32 undef) + br label %for.cond28thread-pre-split + +if.else24: ; preds = %if.then16 + store i32 %conv15, i32* @g_193, align 4 + %conv25 = trunc i32 %l_395.0 to i8 + br label %for.cond28thread-pre-split + +for.cond28thread-pre-split: ; preds = %if.else24, %if.then20, %if.end + %l_288.1.ph = phi i32 [ %l_288.0, %if.end ], [ %or17, %if.else24 ], [ %or17, %if.then20 ] + %p_28.addr.1.ph = phi i8 [ %p_28.addr.0, %if.end ], [ %conv25, %if.else24 ], [ %p_28.addr.0, %if.then20 ] + %.pr = load i32* @g_103, align 4 + %tobool2933 = icmp eq i32 %.pr, 0 + br i1 %tobool2933, label %for.cond, label %for.cond28.for.cond.loopexit_crit_edge + +for.cond31: ; preds = %for.cond31, %lor.end, %for.cond + br label %for.cond31 +} + +declare i32 @func_39(i32, i32, i32, i32) |