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Diffstat (limited to 'llvm/test/CodeGen/ARM/usat.ll')
| -rw-r--r-- | llvm/test/CodeGen/ARM/usat.ll | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/usat.ll b/llvm/test/CodeGen/ARM/usat.ll new file mode 100644 index 00000000000..8f19d11ef7b --- /dev/null +++ b/llvm/test/CodeGen/ARM/usat.ll @@ -0,0 +1,214 @@ +; RUN: llc -mtriple=armv4t-eabi %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=V4T +; RUN: llc -mtriple=armv6-eabi %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=V6 +; RUN: llc -mtriple=armv6t2-eabi %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=V6T2 + +; Check for several conditions that should result in USAT. +; For example, the base test is equivalent to +; x < 0 ? 0 : (x > k ? k : x) in C. All patterns that bound x +; to the interval [0, k] where k + 1 is a power of 2 can be +; transformed into USAT. At the end there are some tests +; checking that conditionals are not transformed if they don't +; match the right pattern. + +; +; Base tests with different bit widths +; + +; x < 0 ? 0 : (x > k ? k : x) +; 32-bit base test +define i32 @unsigned_sat_base_32bit(i32 %x) #0 { +; CHECK-LABEL: unsigned_sat_base_32bit: +; V6: usat r0, #23, r0 +; V6T2: usat r0, #23, r0 +; V4T-NOT: usat +entry: + %cmpLow = icmp slt i32 %x, 0 + %cmpUp = icmp sgt i32 %x, 8388607 + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %x + %saturateLow = select i1 %cmpLow, i32 0, i32 %saturateUp + ret i32 %saturateLow +} + +; x < 0 ? 0 : (x > k ? k : x) +; 16-bit base test +define i16 @unsigned_sat_base_16bit(i16 %x) #0 { +; CHECK-LABEL: unsigned_sat_base_16bit: +; V6: usat r0, #11, r0 +; V6T2: usat r0, #11, r0 +; V4T-NOT: usat +entry: + %cmpLow = icmp slt i16 %x, 0 + %cmpUp = icmp sgt i16 %x, 2047 + %saturateUp = select i1 %cmpUp, i16 2047, i16 %x + %saturateLow = select i1 %cmpLow, i16 0, i16 %saturateUp + ret i16 %saturateLow +} + +; x < 0 ? 0 : (x > k ? k : x) +; 8-bit base test +define i8 @unsigned_sat_base_8bit(i8 %x) #0 { +; CHECK-LABEL: unsigned_sat_base_8bit: +; V6: usat r0, #5, r0 +; V6T2: usat r0, #5, r0 +; V4T-NOT: usat +entry: + %cmpLow = icmp slt i8 %x, 0 + %cmpUp = icmp sgt i8 %x, 31 + %saturateUp = select i1 %cmpUp, i8 31, i8 %x + %saturateLow = select i1 %cmpLow, i8 0, i8 %saturateUp + ret i8 %saturateLow +} + +; +; Tests where the conditionals that check for upper and lower bounds, +; or the < and > operators, are arranged in different ways. Only some +; of the possible combinations that lead to USAT are tested. +; +; x < 0 ? 0 : (x < k ? x : k) +define i32 @unsigned_sat_lower_upper_1(i32 %x) #0 { +; CHECK-LABEL: unsigned_sat_lower_upper_1: +; V6: usat r0, #23, r0 +; V6T2: usat r0, #23, r0 +; V4T-NOT: usat +entry: + %cmpLow = icmp slt i32 %x, 0 + %cmpUp = icmp slt i32 %x, 8388607 + %saturateUp = select i1 %cmpUp, i32 %x, i32 8388607 + %saturateLow = select i1 %cmpLow, i32 0, i32 %saturateUp + ret i32 %saturateLow +} + +; x > 0 ? (x > k ? k : x) : 0 +define i32 @unsigned_sat_lower_upper_2(i32 %x) #0 { +; CHECK-LABEL: unsigned_sat_lower_upper_2: +; V6: usat r0, #23, r0 +; V6T2: usat r0, #23, r0 +; V4T-NOT: usat +entry: + %cmpLow = icmp sgt i32 %x, 0 + %cmpUp = icmp sgt i32 %x, 8388607 + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %x + %saturateLow = select i1 %cmpLow, i32 %saturateUp, i32 0 + ret i32 %saturateLow +} + +; x < k ? (x < 0 ? 0 : x) : k +define i32 @unsigned_sat_upper_lower_1(i32 %x) #0 { +; CHECK-LABEL: unsigned_sat_upper_lower_1: +; V6: usat r0, #23, r0 +; V6T2: usat r0, #23, r0 +; V4T-NOT: usat +entry: + %cmpUp = icmp slt i32 %x, 8388607 + %cmpLow = icmp slt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 0, i32 %x + %saturateUp = select i1 %cmpUp, i32 %saturateLow, i32 8388607 + ret i32 %saturateUp +} + +; x > k ? k : (x < 0 ? 0 : x) +define i32 @unsigned_sat_upper_lower_2(i32 %x) #0 { +; CHECK-LABEL: unsigned_sat_upper_lower_2: +; V6: usat r0, #23, r0 +; V6T2: usat r0, #23, r0 +; V4T-NOT: usat +entry: + %cmpUp = icmp sgt i32 %x, 8388607 + %cmpLow = icmp slt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 0, i32 %x + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; k < x ? k : (x > 0 ? x : 0) +define i32 @unsigned_sat_upper_lower_3(i32 %x) #0 { +; CHECK-LABEL: unsigned_sat_upper_lower_3: +; V6: usat r0, #23, r0 +; V6T2: usat r0, #23, r0 +; V4T-NOT: usat +entry: + %cmpUp = icmp slt i32 8388607, %x + %cmpLow = icmp sgt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 %x, i32 0 + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; +; The following tests check for patterns that should not transform +; into USAT but are similar enough that could confuse the selector. +; +; x > k ? k : (x > 0 ? 0 : x) +; First condition upper-saturates, second doesn't lower-saturate. +define i32 @no_unsigned_sat_missing_lower(i32 %x) #0 { +; CHECK-LABEL: no_unsigned_sat_missing_lower +; CHECK-NOT: usat +entry: + %cmpUp = icmp sgt i32 %x, 8388607 + %cmpLow = icmp sgt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 0, i32 %x + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; x < k ? k : (x < 0 ? 0 : x) +; Second condition lower-saturates, first doesn't upper-saturate. +define i32 @no_unsigned_sat_missing_upper(i32 %x) #0 { +; CHECK-LABEL: no_unsigned_sat_missing_upper: +; CHECK-NOT: usat +entry: + %cmpUp = icmp slt i32 %x, 8388607 + %cmpLow = icmp slt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 0, i32 %x + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; Lower constant is different in the select and in the compare +define i32 @no_unsigned_sat_incorrect_constant(i32 %x) #0 { +; CHECK-LABEL: no_unsigned_sat_incorrect_constant: +; CHECK-NOT: usat +entry: + %cmpUp = icmp sgt i32 %x, 8388607 + %cmpLow = icmp slt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 -1, i32 %x + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; The interval is not [0, k] +define i32 @no_unsigned_sat_incorrect_interval(i32 %x) #0 { +; CHECK-LABEL: no_unsigned_sat_incorrect_interval: +; CHECK-NOT: usat +entry: + %cmpUp = icmp sgt i32 %x, 8388607 + %cmpLow = icmp slt i32 %x, -4 + %saturateLow = select i1 %cmpLow, i32 -4, i32 %x + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; The returned value (y) is not the same as the tested value (x). +define i32 @no_unsigned_sat_incorrect_return(i32 %x, i32 %y) #0 { +; CHECK-LABEL: no_unsigned_sat_incorrect_return: +; CHECK-NOT: usat +entry: + %cmpUp = icmp sgt i32 %x, 8388607 + %cmpLow = icmp slt i32 %x, 0 + %saturateLow = select i1 %cmpLow, i32 0, i32 %y + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} + +; One of the values in a compare (y) is not the same as the rest +; of the compare and select values (x). +define i32 @no_unsigned_sat_incorrect_compare(i32 %x, i32 %y) #0 { +; CHECK-LABEL: no_unsigned_sat_incorrect_compare: +; CHECK-NOT: usat +entry: + %cmpUp = icmp sgt i32 %x, 8388607 + %cmpLow = icmp slt i32 %y, 0 + %saturateLow = select i1 %cmpLow, i32 0, i32 %x + %saturateUp = select i1 %cmpUp, i32 8388607, i32 %saturateLow + ret i32 %saturateUp +} |
